Shock controlled rotatable cartridge magazine for firearms



Oct. 28, 1952 K JANSSQN ETAL 2,615,369

SHOCK CCNTROLLED ROTATABLE CARTRIDGE MAGAZINE FOR FIREARM Filed Oct. '7, 1948 2 S I-IEETS- SI-EET 1 Br 9 Ha} Oct. 28, 1952 K. E. JANSSON IETAL SHOCK CONTROLLED ROTATABLE CARTRIDGE MAGAZINE FOR FIREARMS 2 SHEETS-SI-iEET 2 Filed Oct. 7, 1948 fA/VE/W'OR: K/i/PL EMANUEL J/r/vssonl HTTORNEY Patented Oct. 28, 1952 UNITED orrics SHOCK CONTROLLED ROTATABLE CAR- TRIDGE MAGAZINE FOR FIREARMS Karl Emanuel J ansson and Walter Erland Ericsson, Karlskoga, Sweden Application October 7, 1948, Serial No. 53,266

- In Sweden February 3, 1947 The present invention relates to a guiding device for rotating cartridge magazines, especially for automatic firearms, and the object of the invention is to. protect the cartridge feed-down guides against shocks when the heavy cartridge magazine loaded with cartridges is to be checked in its revolving motion. According to the invention, this is attained substantially by means of the feed motion of the cartridge magazine being guided by a coupling device mounted between the cartridge magazine and a part of the firearm or its mounting which takes part in the recoil, said coupling device comprising a grooved disk connected to the rotating shaft of the magazine. The grooves of the disc co-operate with a reciprocatingly mounted guide member, which in turn is intended to be driven from the recoiling part, for instance a curvilinear groove arranged in the loading tray.

This andotherdistinctive features of the invention will be further explained with reference to the construction illustrated in the accompanying drawing in which;

Fig. 1 illustrates the cartridge magazine according tothe invention in longitudinal section,

while Fig. 3 shows an end view of the magazine along the line IIIIII of Fig. 1.

Figs. 2 and 4 are sections along the lines IIII and IV-IV of Fig. 1 respectively.

Fig. is a perspective fragmentary view of the device on an enlarged scale.

The magazine comprises a front and a rear circular cartridge holder I and 2 respectively, which are rigidly connected to a shaft 3 mounted in front and rear bearing frames 4 and 5 respectively, which frames are attached to a nonrecoiling part of the firearm. Each cartridge holder is provided with a number of deep radial recesses 6, each having room for three cartridges and a number of shallow recesses I, each of the latter being capable of receivin one or two cartridges. All together the number of recesses in the construction illustrated amounts to twentytwo. At its rear end the shaft 3 carries a spring casing 8 fixed to the shaft by a key, and a spring holder 9, also constituting a cover for the spring casing. The spring holder is connected to the rear bearing frame 5 and does not take part in the rotation of the shaft. On the outer cylindrical part of the spring casing 8 there is fitted a geared rim II extending around the periphery of the casing, the teeth of said rim engaging a gear I2. The shaft I3 of the gear I2 is provided with a crank I4. Said shaft I3 is mounted in a bearing I5, which is rigidly connected to the 3 Claims. (CI. 8933) rear bearing frame 5. The sprin casing 8 is provided on its periphery with twenty-two ratchet teeth It corresponding to the twenty-two recesses 6 and I of the cartridge holders I, 2.- A ratchet I! (Fig. 4) under the influence of a spring I8 co-operates with the teeth I6. 'Inside the spring casing 8 there is a magazine spring I9. the one end of which is attached to the spring casing 8, while this other end is secured to spring holder 9. A housing 20 having inner teeth is fixedly mounted on shaft 3 by means of a key. The teeth of housing 20 engages two intermediate gears 2| mounted on a flanged sleeve 22 rotatable on shaft 3. The end of sleeve 22 is connected to one end of an arm 23, theother end of which is pivoted to a link 24 adjustable in length. The other end of link 24 is secured to a shaft 30 rotatably supported by stationary frame 4, The teeth of the intermediate gears 2| also mesh with'a gear 25 rigidly connected to a disc 26-which is rotatably mounted with its hub on sleeve 22. A nut 4| retains the entire assembly on shaft 3 so that shaft 3 can rotate independently of arm 23. The pitch diameter'of the teeth ofhousing 20 is double the pitch diameter of gear 25 'so that disc 26 will be rotated twice when the cartridge holders I and '2 are rotated once. Disc 26 has in its outer face a star-shaped groove with eleven points as can best be seen on Figs. 3 and '5. These points are so spaced that they correspond to the twenty-two recesses 6 and I of the cartridge holders when disc 26 makes two revolutions. As can best be seen on Fig. 5, groove 21 is engaged by a guide pin 28 extendin from a set-off arm 29 which, in turn, is secured to shaft 30. Parallel to this arm 29 another arm 3| is loosely mounted on shaft 30 and yieldably coupled with arm 29. For this purpose, arm 29 is provided with a sleeve portion 39 in which a pin 32 is slidable. A nose 32' on this pin protrudes from sleeve 39 and is engageable with a notch 3| in the front end of arm 3|. A spring 40 disposed within sleeve 39 urges nose 32 into engagement with notch 3|. Arm 3| is provided with a longitudinally elongated slot 31 engaged by a pin 38 on a link 33 guided in frame 4 and at its lower end provided with a guide pin 34, which moves in a groove in the loading tray 35 of the firearm. This groove is so shaped that the link 33 moves upwards and downwards during the recoilmotion of the loading tray 35.

For filling the magazine with cartridges, the cartridge holders are rotated backwards by means of the crank I4, simultaneously causing the magazine spring I9 to be loaded. When the crank I4 is released the cartridges in one of the slots 6 of the magazine will rest against a feeddown guide 36 and thus prevent the cartridge holders from being revolved forwards by the action of the loaded magazine spring I9. After firing a shot, the cartridges located above the loading tray are fed downwards in the respective slot by one step (see Fig. 2), causing the lowermost cartridge to fall down onto the loading tray 35. When all the cartridges located above the loading tray have been fed down, the magazine is turned one step by the action of the magazine spring I9, whereupon it is stopped when the next cartridge engages the feed-down guide 36. As a result, pin 28 which is actuated by'link 33 as previously explained is compelled to slide up and down in the same portion of groove 21 until the respective slot of the magazine is empty so that spring I9 can turn the magazine and with it geared housing whereupon pin 28 will engage the adjacent portion of groove 21. The same cycle is now repeated for the cartridges in the next slot 6 and so forth. The cartridge holders 6, I are prevented by the ratchet I! to rotate backwards by vibrations during the feeding-down of the cartridges. The velocity of rotation is controlled by the guide pin 28, which by its movement up and down in the groove 21 controls the rotational velocity of the disc 26, so that shocks are prevented when the rotating motion of the heavy magazine is checked by the feed-down guide 36. If the guide pin 28 of the arm 29 for some reason should become jammed in the groove 21 damage to link'33 is prevented by nose 32' slipping out of notch 3| causing arm 29 to become disengaged from the arm 3 I.

The invention is naturally not limited to the construction described and illustrated but may be varied in a number of different manners within the scope of the invention.

Having now particularly described the nature of our invention and the manner of its operation what we claim is:

1. A shock absorbing device for a cartridge magazine of a recoiling'gun comprising a shaft mounted for rotation in unison with said magazine, and yielding coupling means disposed between said magazine and a member of the gun partaking in the recoil movement of the gun for controlling the rotary feed motion of the magazine, said coupling including a disc operatively connected to said magazine shaft and having a star-shaped guide groove in one of its faces, the star points of said groove corresponding to cartridge positioning recesses of the magazine, a reciprocatingly mounted guide member including a pin slidable'in said groove for controlling the velocity of the feed rotation of the magazine, and a control member operatively connected with said member partaking in the recoil action of the gun and actuated by the said recoil movement for.

effecting a reciprocating movement of said guide member in response to the recoil action of the gun and the feed rotation of the magazine.

2. A shock absorbing control device as described in claim 1, in combination with a first arm supporting said pin, a shaft rotatably mounted on a stationary part of the gun and supporting said arm, a second arm supported on said shaft and positioned in alignment'with a portion of said first arm, yieldable connecting means yieldably and releasably coupling the free end of the second arm with the aligned portion of the first arm, and linkage means connected to said. arm and said gun member partaking in the recoil action of the gun for imparting to said arms and, hence, said guide pin a movement relative to said star groove in response to the recoil action of the gun;

3. A shock absorbing control device as described in claim 1, wherein the disk is rotatably mounted on said magazine shaft, and wherein a gear train couples the disk with the shaft for joint rotation, the said gear train effecting at least two revolutions of the disk for each revolution of the magazine.

KARL EMANUEL JANSSON. WALTER ERLAND ERICSSON,

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

